People are saying, "I have a right to my opinion. Don't just keep condescending, telling me what to think." There's something slightly liberating about that, but also it lends itself to being taken advantage of, because in come the demagogues.

People think there's a single solution to complex problems, and the solution is often making an enemy of a group of people - pulling back and rejecting the other.

To be effective at selling ideas, at being a lobbyist, influencing other people, you have to be very sure of yourself.

I see [activists] getting really angry that people won't just do what the evidence tells them, and that's not very helpful. You need to actually think why that is.

I sound like a church nut, but look at the role of the churches in the civil rights movement in the States. People are brought together in other ways that can become drivers of change.

Until you have looked in depth at the system and found out where women in Egypt are not being cut through female genital mutilation, or where kids in Vietnam are not malnourished, or where hospitals in America are getting rid of the superbugs anyway - unless you have that level of curiosity about what's going on without you, you will always come in with your great new recipe and just ignore what's going on, and that will make you much less effective at what you're trying to achieve.

Activists can get very preachy about things. It's more about understanding people's own experiences and tapping into them.